Duo Chek sg tester [RE-wrenches]

[Jim Duncan]

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10 or so years ago, a friend that does maintenance for the FAA, offered 
me 18 C&D 2V 660A/8hr cells from a backup power bunker for nav equipment 
for DFW airport. (They were being replaced with gels after almost 20 
years of float service!)I ended up donating them to a small community 
water pumping outfit east of here. 
However, I kept the Duo-Chek brand battery and coolant tester he gave me 
which is all I have ever used for battery SOC readings. Does anybody 
else use these handy little guys or are the floating colored balls 
accurate enough? 
My only complaint is the temperature of the single drop of electrolite 
immediately reaches the temp of the Duo Check and not the actual 
batteries temp. Any comments?
http://www.kerncoinstr.com/11j14.htm

Jim Duncan
North Texas Renewable Energy Inc
Fort Worth, Texas

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